-
Article type: Cover
2008 Volume 52 Issue 2 Pages
Cover1-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App1-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App2-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App3-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App4-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Index
2008 Volume 52 Issue 2 Pages
Toc1-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
G. SAITO
Article type: Article
2008 Volume 52 Issue 2 Pages
95-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Haizhu LI, Tadao HAMAZAKI, Yoshitaka NAGATOMO, Masao SAKAI
Article type: Article
2008 Volume 52 Issue 2 Pages
96-106
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
Characteristics of alpine grassland soils and the relationships between level of pasture degradation and soil fertility in Zeku of the eastern part of Qinghai-Tibet plateau were investigated. The lightly degraded alpine pasture soils in Zeku were Haplic Phaeozems (Siltic, Calcaric) with a mollic horizon and the moderately and heavily degraded alpine pasture soils were Haplic Cambisols (Siltic, Calcaric) without a mollic horizon. Texture of Zeku soils was silt loam, derived from calcareous loess, and major clay minerals were mica, kaolin, vermiculite and chlorite. Organic carbon (OC) content, total nitrogen (TN) content and CEC of the soils ranged from 14.8 to 39.5 g kg^<-1>, from 1.4 to 4.0 g kg^<-1> and from 10.7 to 25.4 cmol_c kg^<-1> in the surface horizons, respectively. Values of the soil pH (H_2O) ranged from 7.6 to 8.8 and the soils contained 74 to 104 g kg^<-1> of calcium carbonates. However, they did not have any horizon of secondary carbonates accumulation. Moreover, accumulation of salts in the soils was not observed. Available nitrogen (AN) content ranged from 35 to 66 mg kg^<-1> and available phosphorus content ranged from 6 to 20 mg P_2O_5 kg^<-1> in the surface horizons. The level of the both contents was very low. In the surface horizons, the OC, TN and AN content, and CEC of the soils decreased clearly with pasture degradation. On the contrary pH, base saturation percentage and calcium carbonates content increased with pasture degradation.
View full abstract
-
Suzette Binongo LINIA, Masanori OKAZAKI, Sonoko Dorothea KIMURA, Shoji ...
Article type: Article
2008 Volume 52 Issue 2 Pages
107-117
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
Laboratory experiments on ammonium (NH_4^+-N) releasing from lowland (Soil 1) and upland (Soil 0) soils classified as Eutropepts in Leyte of the Philippines were studied to evaluate its response to urea type fertilizers with different NH_4^+-N releasing time. Although the X-ray diffraction (XRD) indicated a dominant presence of kaolin group minerals, halloysite or kaolinite was not clearly identified under the scanning electron microscope. Both Soil 1 and Soil 0 samples possessed variable charge. Without fertilizer and totally anaerobic condition, the highest NH_4^+-N amount in soils was observed at two- week incubation. Applications of common urea and slow-release urea: Meister 40 and Meister 70 (M40 and M70 are expected to release 80 % of their nitrogen at 400 days and 700 days at 20℃, respectively) to lowland soil samples significantly released a larger amount of NH_4^+-N than the upland soil. In addition, at 84 days, the rate of release of NH_4^+-N from the slow-release fertilizers evaluated was enhanced by increasing the temperature condition to 30℃. The low selective adsorption capacity of NH_4^+-N in kaolin group minerals found in the lowland and upland soils, as well as the variable charge of the soil containing a slightly negative charges should be considered when planning N fertilization to avoid losses of large amounts of unutilized N especially to perennial crops whose N requirement might be lower at early growth.
View full abstract
-
Hideo KUBOTERA, Shin-Ichiro WADA
Article type: Article
2008 Volume 52 Issue 2 Pages
118-125
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
Experimental conditions for the direct measurement of nitrate retention of soils were investigated. The method is based on the recovery ratio for nitrate ion that was added to soils as diluted solution. The difference in concentration between the initial solution and supernatant after shaking and centrifuging is the amount of nitrate retained on soil particles. The investigation showed that addition of 7.5 mL of 5 mmol L^<-1> potassium nitrate solution to 5 g air-dried fine earth with 30 min shaking could achieve conditions of moisture and nitrate concentration similar to Japanese upland fields. The measurement could be completed within 3 h and the precision of replicated measurement was high. The value obtained by this method, tentatively called nitrate holding capacity (NHC), showed a clear positive relation with AEC value for 15 soil samples and 5 weathered tephra. However NHC values were smaller than AEC values in samples with large AEC values; this result indicates that only a part of the total positive charge works as nitrate retention sites in field conditions.
View full abstract
-
Toshiaki OHKURA
Article type: Article
2008 Volume 52 Issue 2 Pages
126-128
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Hitoshi KANNO, Hideaki HIRAI, Tadashi TAKAHASHI, Masami NANZYO
Article type: Article
2008 Volume 52 Issue 2 Pages
129-133
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Hiroaki KURIHARA
Article type: Article
2008 Volume 52 Issue 2 Pages
134-135
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Hirotomo OHBA
Article type: Article
2008 Volume 52 Issue 2 Pages
136-137
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2008 Volume 52 Issue 2 Pages
138-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2008 Volume 52 Issue 2 Pages
139-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
140-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App5-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App6-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App7-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Appendix
2008 Volume 52 Issue 2 Pages
App8-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Cover
2008 Volume 52 Issue 2 Pages
Cover2-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS
-
Article type: Cover
2008 Volume 52 Issue 2 Pages
Cover3-
Published: December 31, 2008
Released on J-STAGE: June 30, 2018
JOURNAL
FREE ACCESS